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BOTANICAL MAGAZINE. [Vol. xvm. 



crural elevated line, densely spinulose all over; spinules erect, often broad 

 and flattened, obtuse or truncate moreover often slightly curved at the apex. 

 Microspores elliptical, slightly oblique in form. 



Nom. Jap. Hime-midzunira (nov). 



Hab. Prov. Shinano : Lake Nojiri {Komesaburo Yazawa ! 1903 ; T. 

 Mdkino ! Aug. 30, 1904 ; K. Shibata ! Sept. 26, 1904). 



As diagnosed above, this differs from the typical one of Europe, which 

 has the sporangia with a narrow velum, macrospores with narrower spin- 

 ules, and slightly papillose microspores ; and from var. Braunii Engelm. 

 ( = /. Braunii Durieu) of North America, which has the leaves with few 

 stomata towards the tip, and spotted sporangia, more approaching the 

 latter than the former. In Japan it is very rare, and the plant in 

 question was found growing in the sandy bottom of shallow water near 

 the margin of Lake Nojiri in the northern part of the province of Shinano, 

 where Mr. Komesaburo Yazawa collected it first. 



Isoetes (Amphibia?) japonica A. Braun in Verhandl. Bot. Ver. 

 Brandenb. (1862) p. 33 ; Baker in Journ. Bot. (1880) p. 109 ; Id. Handb. 

 Fern-Allies, p. 132; Miq. Pro!. Fl. Jap. p. 390; Franch. et Sav. Enum. 

 PI. Jap. II. p. 201 ; K. Ito, Nippon-Shokubutsu-Dzusetsu I. tab. 45 ; Sade- 

 beck in Engler et Prantl, Nat. Pflanzenfam. I. 4, p. 778 ; Matsum. Ind. PI. 

 Jap. I. p. 363. 



Calamaria japonica O. Kuntze, Rev. Gen. PL II. p. 828. 



Isoetes edulis Sieb. ex Miq. Prol. Fl. Jap. p. 390. 



Perennial, sometimes wholly submersed. Caudex 3-lobed, ^-2| cm. 

 across, blackish, densely emitting umber-coloured roots. Leaves tufted, 

 erect or erect^patent, about 6-100 or more in number, 8-90 cm. long, 1-3J 

 mm. across below the middle, bright green, white and pellucid towards the 

 base, subflaccid, slender, tapering towards the point which is obtuse under lens, 

 subangulato-semiterete, plane in front, septate, usually stomatiferous, the lower 

 edges thin and decurrent from the dilated and concave or subconcave phyl- 

 lopode, which is subsquare or subdeltoid-subsquare or oval-subsquare (4-14 mm. 

 long, 5-12 mm. broad) in form and thinly membranaceous (translucent to- 

 wards the margin) in the border and thickly close-imbricated. Velum none ; 

 fovea elliptical to narrowly oblong. Ligule thinly membranaceous, cordato- 

 deltoid, long-attenuated above and acuminate, 3-8 mm. long. Sporangia 

 elliptical to -narrowly oblong, compressed, thinly and delicately membrana- 



